Main WPF project cannot find the WPF control Library dll unless netloaded by AutoCAD

[ilovejingle]

In order to reuse my wpf project, I have created a wpf control library. this compile to the first a.dll

<UserControl x:Class="Stair_Creator_Lib.stair_view"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006" 
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008" 
             xmlns:local="clr-namespace:Stair_Creator_Lib"
             mc:Ignorable="d" 
             d:DesignHeight="210" d:DesignWidth="320">
....
</UserControl>

I also implemented some button and AutoCAD login in this WPF control library.

Then In my main project, I have created a WPF window using the WPF control library

<Window x:Class="BGS_Acad_Tool.Views.stair_window"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:BGS_Acad_Tool.Views"
        xmlns:sta="clr-namespace:Stair_Creator_Lib;assembly=Stair_Creator_Lib"
        mc:Ignorable="d"
        Title="stair_window" Height="210" Width="320">
    <sta:stair_view/>
</Window>

all the buttons/ textboxes are show correctly in the window. then in my main program, I try to create the window and show it.

        [CommandMethod ("TEST")]
        public void cmdTest()
        {
            var win = new stair_window();
            Application.ShowModalWindow(Application.MainWindow.Handle, win);
        }

This complied to the second b.dll, I have referenced a.dll in the main function. Everything compiled and build correctly

When I run AutoCAD, if I only netload b.ll, and run the "TEST" command,  it throws an exception : 

Exception thrown: 'System.Windows.Markup.XamlParseException' in PresentationFramework.dll

Additional information: Could not load file or assembly 'Stair_Creator_Lib, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

If I netload a.dll and b.dll , it works as expected. Why this is the behavior? I have put both dlls in the same folder, why I still need to netload both of them in AutoCAD ? 

[jtoverka]

Check this post here:

(theswamp.org) .NET Plugin Loading Resources From External DLL 

[genosyde]

do you know .bundle folder in acad concerned Auto-Load

if you so, this post will be useful for you.

https://forums.autodesk.com/t5/net/dll-in-plugin-bundle-fail-to-be-autoloaded/td-p/8344111

netload command is so hard to debug making program.